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// RUN: %clang_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
#include "test.h"
pthread_mutex_t Mtx;
int Global;
void *Thread1(void *x) {
pthread_mutex_init(&Mtx, 0);
pthread_mutex_lock(&Mtx);
Global = 42;
pthread_mutex_unlock(&Mtx);
barrier_wait(&barrier);
return NULL;
}
void *Thread2(void *x) {
barrier_wait(&barrier);
pthread_mutex_lock(&Mtx);
Global = 43;
pthread_mutex_unlock(&Mtx);
return NULL;
}
int main() {
barrier_init(&barrier, 2);
pthread_t t[2];
pthread_create(&t[0], NULL, Thread1, NULL);
pthread_create(&t[1], NULL, Thread2, NULL);
pthread_join(t[0], NULL);
pthread_join(t[1], NULL);
pthread_mutex_destroy(&Mtx);
return 0;
}
// CHECK: WARNING: ThreadSanitizer: data race
// CHECK-NEXT: Atomic read of size 1 at {{.*}} by thread T2:
// CHECK-NEXT: #0 pthread_mutex_lock
// CHECK-NEXT: #1 Thread2{{.*}} {{.*}}race_on_mutex.c:18{{(:3)?}} ({{.*}})
// CHECK: Previous write of size 1 at {{.*}} by thread T1:
// CHECK-NEXT: #0 pthread_mutex_init {{.*}} ({{.*}})
// CHECK-NEXT: #1 Thread1{{.*}} {{.*}}race_on_mutex.c:8{{(:3)?}} ({{.*}})
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